linux-kernel - Re: [PATCH v2 1/2] gpiolib: of: Prepare of_gpiochip_add() / of_gpiochip

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Date:   Thu, 10 Nov 2022 16:07:26 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v2 1/2] gpiolib: of: Prepare of_gpiochip_add() /
 of_gpiochip_remove() for fwnode

Hi Andy,

On 10.11.2022 14:53, Andy Shevchenko wrote:
> On Thu, Nov 10, 2022 at 02:22:40PM +0100, Thierry Reding wrote:
>> On Tue, Nov 08, 2022 at 03:38:52PM +0200, Andy Shevchenko wrote:
> ...
>>> +	np = to_of_node(chip->fwnode);
>> This breaks a number of GPIO controllers on Tegra where chip->fwnode
>> ends up never getting set. I also see this break drivers like the MFD-
>> based gpio-max77620, so I don't think this is anything specific to the
>> Tegra drivers.
>>
>> Looking at how fwnode handling works, it seems like we're checking the
>> wrong value here, since chip->fwnode is only for explicit overrides of
>> the fwnode value.
>>
>> The below patch fixes the regression for me:
> Thank you! Can you submit it as a formal fix? (Also see below)
> Of if Bart prefers I can respin fixed verison. Bart?
>
> ...
>> -       np = to_of_node(chip->fwnode);
>> +       np = to_of_node(chip->gpiodev->dev.fwnode);
> dev_fwnode(&chip->gpiodev->dev)
>
> ...
>
>
> Your report makes me wonder if I can Cc you the patch that changes that logic,
> so you can help with a testing on OF platforms.

I've also found this issue with today's linux-next and bisected to this 
patch. I confirm that the above change fixes the boot issue on Raspberry 
Pi 4B and Odroid-M1 boards. Feel free to add:

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland